October 3, 2019 Subject:
The images were not ripped on a Mac, they were done via GNU ddrescue on Linux. You're right that mac cruft is present on disks 3 and 4, though; I suspect this was from when I inserted the disks into a floppy drive on a Mac, it has saved them back to the floppy. You'll notice the timestamps on the mac cruft are roughly a year earlier than this archive item was uploaded (when I prepared the proper rips).
October 2, 2019 Subject:
Not too sure about these "disk images"...
Disk images have Mac OSX cruft left in them - .fseventsd, .Trashes, ._.Trashes
Possibly these were added accidentally when the user put the disk in a Mac for ripping.
Otherwise, the software installs fine on Windows 3.1 in DOSBox.